131220230231 has 4 divisors (see below), whose sum is σ = 131507364672. Its totient is φ = 130933095792.

The previous prime is 131220230189. The next prime is 131220230249. The reversal of 131220230231 is 132032022131.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 132032022131 = 563 ⋅234515137.

It is a cyclic number.

It is not a de Polignac number, because 131220230231 - 2²² = 131216035927 is a prime.

It is a super-2 number, since 2×131220230231² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131220233231) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 143566535 + ... + 143567448.

It is an arithmetic number, because the mean of its divisors is an integer number (32876841168).

Almost surely, 2^131220230231 is an apocalyptic number.

131220230231 is a deficient number, since it is larger than the sum of its proper divisors (287134441).

131220230231 is an equidigital number, since it uses as much as digits as its factorization.

131220230231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 287134440.

The product of its (nonzero) digits is 432, while the sum is 20.

Adding to 131220230231 its reverse (132032022131), we get a palindrome (263252252362).

The spelling of 131220230231 in words is "one hundred thirty-one billion, two hundred twenty million, two hundred thirty thousand, two hundred thirty-one".